Kinetics, Isotherms and Equilibrium Study of Co(II) Adsorption from Single and Binary Aqueous Solutions by Acacia nilotica Leaf Carbon

doi:10.1016/j.cjche.2014.08.006

摘要/Abstract

摘要： The removal of cobalt ion from aqueous solution by Acacia nilotica leaf carbon (HAN), is described. Effect of pH, agitation time and initial concentration on adsorption capacities of HAN was investigated in a batch mode. The adsorption process, which is pH dependent, shows maximum removal of cobalt in the pH range 5 for an initial cobalt concentration of 50mg·L^-1 The experimental data have been analyzed by using the Freundlich, Langmuir, Temkin and Dubinin-Radushkevich isotherm models. The batch sorption kinetics have been tested for a pseudofirst order, pseudo-second order and Elovich kinetic models. The rate constants of adsorption for all these kinetic models have been calculated. Results showed that the intraparticle diffusion and initial sorption of Co(II) into HAN was themain rate limiting step. The adsorption of cobalt ion was confirmed through instrumental analyses such as scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The desorption and recycling ability of HAN were also found. We conclude that HAN can be used for the efficient removal of cobalt from aqueous solution.

关键词: Adsorption isotherms, Adsorption kinetics, Copper (II), Acacia nilotica, Desorption

Abstract: The removal of cobalt ion from aqueous solution by Acacia nilotica leaf carbon (HAN), is described. Effect of pH, agitation time and initial concentration on adsorption capacities of HAN was investigated in a batch mode. The adsorption process, which is pH dependent, shows maximum removal of cobalt in the pH range 5 for an initial cobalt concentration of 50mg·L^-1 The experimental data have been analyzed by using the Freundlich, Langmuir, Temkin and Dubinin-Radushkevich isotherm models. The batch sorption kinetics have been tested for a pseudofirst order, pseudo-second order and Elovich kinetic models. The rate constants of adsorption for all these kinetic models have been calculated. Results showed that the intraparticle diffusion and initial sorption of Co(II) into HAN was themain rate limiting step. The adsorption of cobalt ion was confirmed through instrumental analyses such as scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The desorption and recycling ability of HAN were also found. We conclude that HAN can be used for the efficient removal of cobalt from aqueous solution.

Key words: Adsorption isotherms, Adsorption kinetics, Copper (II), Acacia nilotica, Desorption

P. Thilagavathy, T. Santhi . Kinetics, Isotherms and Equilibrium Study of Co(II) Adsorption from Single and Binary Aqueous Solutions by Acacia nilotica Leaf Carbon[J]. , 2014, 22(11/12): 1193-1198.

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